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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a0730dc81d8a994b165b5f6edc87c7fe787f202373d9630bf3e26e65ef4ae8e' 
  AND token = 'VsvpnwoW8gdZZ7tbfi+W3u+F1nbfSmzz9Ggl9X9apyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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