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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c8643a8e17104f6b915709884136f765be104befd62ac8d5a11d563acf4cff' 
  AND token = 'wXGqlN7bNI4l57Vax9rlcz3zOHB5HmHrBWPCN18OrM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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