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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0a190dc5cb2582fcc3d73c7919e6a72ba3f858ad753cf1e3b2d7e0a7a83246e' 
  AND token = 'Wawhg6HBqWR2PfNQRmzr5svPkMyybV3xBmDel+elCok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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