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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa89d0df19d2e1c5e1b14798d3a3846d745d773906965b3625b7b94d6aff664d' 
  AND token = 'i2wMWKbmS4WxVFizXcFimoKjkfj3DCl8Fsv5dhjh6jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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