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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87aee3c62bc5f429f4baa55293b3d766835b08fef20e5b5025b4c8cfd96404d1' 
  AND token = 'D5PZhiuYWMlu6gzvCxL/UNAJeztmfUZDoot2/4b4smk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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