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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0766b142d92147737a56cbdf1f11afa6e9f9bd8ece8ffefed20bf5614666b5e1' 
  AND token = 'HuvoBsLaEa8+ixexnF4KhhDYtV5jzx9NOrt7Gucdz9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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