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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01ab8d6a74f880a2e977958329d2136cd92fcbcb75cfda255fecc12e5cc4802c' 
  AND token = 'mASUIsbngSkDI2Cq9qJ3U2M3rcfLdgnAybrnfKqVAk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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