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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c7191b4cbc0958ead7763ce6200f404264f30c5966a3e7b1460c6bb0c8f69c3' 
  AND token = 'bkjxP4t30qhPl+gLz7t4h9nqB+HCgnuyq9zTQcrqSuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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