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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8840367dc2db422630d29a3f78e9452ab083fb65c6a2169c58a2d11d0f8aabf1' 
  AND token = 'XExjkLpC02EWmH58Db/X3LClrXEViZxZuCBHRM/L7dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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