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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeba728f08a5e97ded789719e4cb98744245cee222530c8e2a1fe2212a6f4c2f' 
  AND token = 'GSTpO4o/JKxr4Mg02mMiPwxKnjZQpKa/tVZWrv8ZRqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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