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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dd9ba3c56f8df9879532ab5c794d1f83fa8be960ab5a3e71e87532eb285c515' 
  AND token = 'olMD0owcGp5PmM4h9OcW9TLgvN/xMjk6LD5JPooqkXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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