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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d40570d5a78cd8f5ef6b174f6116928baf0d46b4188ad7b984ff1eaceaf118' 
  AND token = 'ywWHE9U8VTUf5szE2gmO4Fle2GltFqU8LLqJQLEroWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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