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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e770237e91a19abcb063c51a1cc465de5b4da4f2f2de3feeee54ac79ab34ffb6' 
  AND token = 'eiwn3SoptdzylU6FOibqQ6fulMAmgV9EkVHBUefTsP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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