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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19525305516996d4be64e0a8d513a44e16516ab8048905d7fe5e3b3f1466826c' 
  AND token = 'hYvOSjHLhl1aIplW/pF+eQRxIOCLBJUf4Q1IL2WIEJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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