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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd606b60e5f6c62cfaa61feae01491d43a771ff1f08a2cf4850aa3e8f9eacf2c6' 
  AND token = 'ztsRmunXhKT7TL8z1kVMrve8qKTviuzNZfoJ7b9lH7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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