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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35e452045bba650f8de235704144a34d852cc6299f4d64dc21d9d6591b5f2f76' 
  AND token = '5cjfj+5mEhXeB37xmsaxFlZxlBinV3We4It83vxVAIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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