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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79903a1640bf98e1fc1bc1d1426b31a441cee12884dc01efb7725ef7c7ddc92f' 
  AND token = 'IQRQOS9B3Hjgo/z61igdCotoXtV0SOjZyxaXWifnlmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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