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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f74d7d51a491bc895c0ebaff468120d2627dd4cb14850578909f9960b52a8a' 
  AND token = '9Zrez+P0H61XadX7uSS9xsum/MFDP2q03ab6X0uFd+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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