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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df91572f8fc11ca6c32d8694f212f62794935d0b132c0bc8080676217e4a3fa' 
  AND token = '6JefE8PFy1CrZ3UmMdEGCLCmk3zG8iWdJw+kZoUWYZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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