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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa8f1db85bad4f658c6a3e64f655aaf278bdea9400a9f6ac4af5882fd4300ac' 
  AND token = 'kVgaeDfqKnGV1H+bu53CBnHzoIF14htoDa5gM+kZLUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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