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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba154fc3ea2972a42e021f17446bdc4d02510813f4de7f8b2d707a2e594b6c8' 
  AND token = 'r8F7/iaHiNs1nBTlSRwUnoyjRVVmyiLemQ/Bc4krGP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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