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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee884d08891a7a8f39f51d58bd66dcad009a0777c2fdf10deebc72bfad48bca' 
  AND token = '5SfHhsbPQfLvYmk5Yp8bmk/J0noc2XL1Xcdx3R/P+3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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