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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528086eb674d6556caa05ddf694d43d1b57874021efcb4c7d26c4e004023ea0b' 
  AND token = 'wGtE5lQGD2lbC8jhSdMTiC3qJ50UK+s3GTGJ7VgJ8os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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