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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03c53631c31aa90c6cc235400a247be56d4a818584d74fcdb17c9a99fa0fa3c' 
  AND token = '3RL/c07Rq6byYKtR6CGM1FGKVcsu8VV3tXz6/djSxDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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