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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9680896ac69507e124bd1eebd8c2160ca8b5a4c3e3cf6ed82c7dc764ca7f68f' 
  AND token = '0rLVA1JikR/mYkVgXWfucsIihZvnagqeZrZjb5RjMJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}