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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ac42893f377c372006e57063e3cfb09c6d2b180105ccf3762a97c79c89964e' 
  AND token = '5pSjeFG2B60DY0CtaCgKg9kYU/ZJs3fEGrb9Afd+q80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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