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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc3f573ae8b1a9b5ec66e9b22936367b1608bf6c0d24affc58a82b2df7c5c729' 
  AND token = '1zzJRM4npbEiDnGcJEdqw4sW/TScbhbFA3UZoXrB1fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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