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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96f568ae654da18552d9054b2617eef32cbdd2c31a98c41acc3b8d2be09cfc6d' 
  AND token = 'Zbf6339PnlddJC0gAUgS+3Oqch5RdyRLvo+NL1kVGN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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