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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '53ea331394389b40d0288aa56cdfee85774654c85d168d6d7f3fe323ea02fe07' 
  AND token = 'Wd6ehSckL8V6BkXCp+QCd8HF5qtpGI/p3orCG7r3OfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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