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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88335903fdf2fd7d65c71ad7d62974c95b1046c3c78eacfb62bee80303c8411c' 
  AND token = '+DIu48vJo/ER7Hdr43H8N74fj4tHt7iQenEoLYdLSU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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