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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35565d7209a39277e66fc36aaf6534ac05368de0349599562182f4d14db83ccd' 
  AND token = 'bF51Et416vbMv5l0c69l0wkGlvlOzfDLE/pls/vbJYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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