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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e9d5d7faa35ae5e81838cc0da54e744490c149885e83229601619c54e7e229' 
  AND token = 'l3ndsVOnWOKTx7RFVdVbONnh0Am1bSY6cKMulZc86cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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