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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b581192dfa2d93ff0c0a94e125505c7f068cf3fb9e08db4c38ba4e499d2a961' 
  AND token = 'zQEoi1ihIvnc0v3J+dZS5gTg6+WeueiqwReNdxCUK2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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