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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693985745ef1989e059b2c7bd5a79f31c6a007902607c9e2d9f63328221e138f' 
  AND token = '5sYRktW8/X7CGrhn8Ye4DB+vLi3Gma0b/6L5iW7OKi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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