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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e88142ab227ef2fb7283939e1324cc8bb0c7a27147f5a855919ca00fcf8673' 
  AND token = 'hP5lO9xS6ThpgMx5XdnVxvQibRybEfJIuAKI8tbKJgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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