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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b084c061d95776703d9b2e413cdfddf3001f5d4ed0347f2cd346032cb330c84b' 
  AND token = '39AqUTnHkqJZapuQQelP1vpkif9O6VzfFZ2P1oyqOEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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