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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a35664675d44960e4b30bf9e5300de086de4ba87261dae17e255de9073192c26' 
  AND token = '2ARwmXek4k4RMXWDkidPgvNtHKtyXxbR9SpgDULEWio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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