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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd164d14aff6da7e1b4aef9bffa9d1c40f24e7250c97ee948d6e2934ebe83477' 
  AND token = 'eExKTQlp/H5gbvaJsZO09rm8O3Ok3L5xU8whL36yW3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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