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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8784c32b02e5dedbc43e894b6ffb66f5064257f4c2b4606c0a74a5f67c84b9d4' 
  AND token = 'Wu/2YaFG8Nv25S0gjoOUqPnCDH9vZ8sWnRY/T/DU8d4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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