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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5daa1d99002aa6764f4acaf94a62b8d4ef7f43552c867ca57ae92e673eb4cd25' 
  AND token = 't2+TwfLl23MNp0etuM1SRq0uI1CP9K/GnINnVwhA0xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00833

JSON explain

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