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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '800d7c8a032025f09d9cd8fe8f17963c84a5e644043cfc785e46bb3cbcd7972a' 
  AND token = 'rAKpv1SJ72jiKSmpn6qY2oOopF7Xwu3b2Ew9W8vVVEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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