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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d792438a6166d1cf224c9dca2d579cc5c711153ae0ece4163b7471dd9dc042a' 
  AND token = '/RIoaSp6vwruwSVH6URTg5/q5byH36oi9KikuJUl4Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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