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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e747c30c2d8c3c7b3eaf48e9ee262fb3cf9e6531d59610e9c8a09bc6a79ab3c' 
  AND token = '6Vq6gtUnR/rxHbN0Yinu8BLwOKqbkxyV5jRJV6vIH24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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