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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7d1c845bd4e7b4845ab9377c85dc0c9fabe017b6eb61923bcc321d34cd52185' 
  AND token = 'CIpapYiYohIS8KoMWHq2hA6tsUFbzFXkF67GPaucRoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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