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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba9fbb690779d944a6452418b092550c9c737c8037cfa8ca85babf8627d95b44' 
  AND token = 'WzcFEH1+m9Dh2u6ofZra5OZWf1CpNus4dYRYEEYpCWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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