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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2932fc464f8b2ba43b1f03362a764d8965aa10c6adff12cbcfb82c2dff3c5d00' 
  AND token = 'Z4vN9yg5797efLAkXRgEXR7sLrEvWHjSltDQOYBJzVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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