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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a0d38a5ea22beccec357cd06b64b83aae908735d402c60c11c0aed7c4ecd45f' 
  AND token = '7W+/XX0mI0EcDfJGMHbPOI372h9WToEUreBnY2JqNSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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