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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a0e632adf03cda9861ec4ba6007ef9b9942d619264aebeb58b9b6787cd0a84' 
  AND token = 'Ft15fDMQ6mke3iXhHPOuyzOufnp4WXItQ4Ew8rjoJDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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