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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e951cd29b487c6e7a04eb623e60e4a2cd3aae585887509634d911760af4eaf45' 
  AND token = 'NQB2vE18wR21y9ENAb0f6sirui9JtOplono4SXjC/hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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