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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f7e13a14dcd970297a75107f1dbeffef0250c633d5577e1785f1a8ea17eec2f' 
  AND token = 'k9ZTgCqB2inVnNY4bTDvz4iekEFB37PNeYiEp93H4eA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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