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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc8279eb39130e57c78b4972987ea7a4b678238bb20da7c135c4f30aae9bc97' 
  AND token = 'YCYGX6bKacZ0TLylZJvzNdF0d1moG0l7S0d4x9wnpW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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