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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3aedf9ae4562f646cb68f191e5d6be904d7e1dbc5b051aad4ac5f6e82b6ed8' 
  AND token = 'oNBSFPhxIvyXZckmUWkY4e1yRjI3a5nNy+6EgW0Kf+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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