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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b2f3413eba653960bc5c3a046e9f5a526560e5fbfa043a6818f8b6a6f10504' 
  AND token = 'oahMV1dY1k0fqBokFRJ/wLpJLa7EdFwsUBpj7bTLqbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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