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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c22389e4a3ca4749690df4aad81a77c914109b7e76684265086c75ebbb119251' 
  AND token = 'kYvuBsFSdS7pMGyliHzgSZ7o1srEiz3NrMvrkRLAK7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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