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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '015c84acb6efb03c1064b581f9a3ffc0136f80300cb69b57d9f4e83ffa2a9444' 
  AND token = 'bCYxRFNVoVNlmf2NBQ9vpAKJ7koyhItjCNF5f0KwEKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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