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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '377f0c0d2774a93144b6f47365a0ced783915e50c8abe2497275f1aac94dd5d1' 
  AND token = 'S9dRc0LV5xXLKbe92DjThVMxzYoj2r2n5jGn07J8l4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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