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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1d1b27f1744a580d72af59fb2f75aa07bc7af74869e1b89399bed7eaabd900' 
  AND token = 'IJrLa8L961UL5N4XhNeeERergPkX3MyDjjhIU8ZM6CY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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