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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16c2bb493a630bbea782edabf7b5e6b282efb3d8e8393dfe188cddcd57d3ca06' 
  AND token = 'cq6108eCFuuHBZw6YfmfROY2EBtSPUCsAOESnfCCZIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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