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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0c81d7f72dd83f6c462b2b37d1e6abc6a556e4ec9ff71bda4a6c18fec0730c' 
  AND token = 'RDDpZRZ/xcGFMejzxs79dAiRawyVldFbpBJ7K3rMWWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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