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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39680af73eecdb4bbfc6d3abb59968192ad8856dbc1f8adbcee31e371c55826d' 
  AND token = 'Jg7KAd36BxeZc6J5199RkAm+nuMF5Hb4ohDLGTfghus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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