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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aeeff3b43d3a6f6bf8622d390081a9d98b0a42fa60b94e0aec8d6c25207490e' 
  AND token = 'ew68Es42PttjlE/PRyIRAhYkecX5RU6mfvHjqRaKFbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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